lib/mpi: replaced MPI_NULL with normal NULL

MPI_NULL is replaced with normal NULL.
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
Reviewed-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>

include/linux/mpi.h

@@ -57,8 +57,6 @@ struct gcry_mpi {
 
 typedef struct gcry_mpi *MPI;
 
-#define MPI_NULL NULL
-
 #define mpi_get_nlimbs(a)     ((a)->nlimbs)
 #define mpi_is_neg(a)	      ((a)->sign)
 

lib/mpi/mpicoder.c

@@ -34,7 +34,7 @@ MPI do_encode_md(const void *sha_buffer, unsigned nbits)
 	uint8_t *frame, *fr_pt;
 	int i = 0, n;
 	size_t asnlen = DIM(asn);
-	MPI a = MPI_NULL;
+	MPI a = NULL;
 
 	if (SHA1_DIGEST_LENGTH + asnlen + 4 > nframe)
 		pr_info("MPI: can't encode a %d bit MD into a %d bits frame\n",
@@ -48,7 +48,7 @@ MPI do_encode_md(const void *sha_buffer, unsigned nbits)
 	 */
 	frame = kmalloc(nframe, GFP_KERNEL);
 	if (!frame)
-		return MPI_NULL;
+		return NULL;
 	n = 0;
 	frame[n++] = 0;
 	frame[n++] = 1;		/* block type */
@@ -92,7 +92,7 @@ MPI mpi_read_from_buffer(const void *xbuffer, unsigned *ret_nread)
 	int i, j;
 	unsigned nbits, nbytes, nlimbs, nread = 0;
 	mpi_limb_t a;
-	MPI val = MPI_NULL;
+	MPI val = NULL;
 
 	if (*ret_nread < 2)
 		goto leave;
@@ -109,7 +109,7 @@ MPI mpi_read_from_buffer(const void *xbuffer, unsigned *ret_nread)
 	nlimbs = (nbytes + BYTES_PER_MPI_LIMB - 1) / BYTES_PER_MPI_LIMB;
 	val = mpi_alloc(nlimbs);
 	if (!val)
-		return MPI_NULL;
+		return NULL;
 	i = BYTES_PER_MPI_LIMB - nbytes % BYTES_PER_MPI_LIMB;
 	i %= BYTES_PER_MPI_LIMB;
 	val->nbits = nbits;

lib/mpi/mpiutil.c

@@ -135,7 +135,7 @@ int mpi_copy(MPI *copied, const MPI a)
 	size_t i;
 	MPI b;
 
-	*copied = MPI_NULL;
+	*copied = NULL;
 
 	if (a) {
 		b = mpi_alloc(a->nlimbs);